package com.lilei.bigdata.mr.wordcount;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.IntWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapreduce.Job;
import org.apache.hadoop.mapreduce.lib.input.FileInputFormat;
import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;

public class WordCountDriver {
    public static void main(String[] args) throws Exception {

        Configuration configuration = new Configuration();
        Job job =   Job.getInstance(configuration);


        //指定本程序的jar包所在的本地路径
        job.setJarByClass(WordCountDriver.class);

        //指定本业务job要使用的mapper/Reducer业务类
        job.setMapperClass(WordCountMapper.class);
        job.setReducerClass(WordCountReducer.class);

        //指定mapper输出数据的kv类型
        job.setMapOutputKeyClass(Text.class);
        job.setMapOutputValueClass(IntWritable.class);

        //指定最终输出的kv类型
        job.setOutputKeyClass(Text.class);
        job.setOutputValueClass(IntWritable.class);

        //指定job的输入原始文件所在目录
        FileInputFormat.setInputPaths(job,new Path(args[0]));
        FileOutputFormat.setOutputPath(job,new Path(args[1]));

        //将job中配置的相关参数，以及job所用的java类所在的jar包，提交给yarn去运行\

        boolean res = job.waitForCompletion(true);
        System.exit(res?0:1);
    }
}
